Java Object equals, hashCode, Hashing Collections and Hash Code Collision

Introduction In this blog post I’ll be focusing on something very fundamental and assumed as easy in the concept, but fairly the subject requires more focus and better apprehending. Besides that I am quite sure you’ll learn many interesting related to this topic. Object equals and hashCode Methods equals and hashCode methods are shipped with

Fedora DNF Proxy

Fedora’s Package manager DNF requires proxy if you are behind a company network. To enter the details: sudo nano /etc/dnf/dnf.conf add the below line and replace it with your settings and credentials: proxy=http://URL:PORT/ proxy_username=OPTIONAL-IF-NOT-MANDATORY proxy_password=OPTIONAL-IF-NOT-MANDATORY save the file and give it a shot. For troubleshooting you can always tail -f /var/log/dnf.log For my Setup Fedora

Builder Pattern in Java

The Builder pattern eliminates building the complexity of the target object as well as eases the construction by providing such methods that will assemble the object same as building a set of blocks. By implementing the Builder pattern, there won’t be any need of larger constructors, parameter objects or custom types. Furthermore, the Builder pattern

Immutable Objects in Java

Immutability of an object indicates that once an object is constructed with given values, its state and values cannot be altered. In case of any value change must result in new object creation. Out of box Java offers some Immutable objects for instance java.lang.String, java.lang.Integer, java.lang.Float, java.math.BigDecimal. Immutable objects make generally a good use in

JSF Input text placeholder

In the Tag description add the pt entry and its corresponding web address <html xmlns=”http://www.w3.org/1999/xhtml” xmlns:h=”http://java.sun.com/jsf/html” xmlns:pt=”http://xmlns.jcp.org/jsf/passthrough”> in the input text declaration <h:inputText styleClass=”form-control” pt:placeholder=”Enter Search Value” required=”true” requiredMessage=”Please enter search value” value=”#{orderController.keyword}” id=”keywordSearch”/>

Java XML Parser

Using Dom4J <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> XMLParser.java import org.apache.commons.lang.StringUtils; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.w3c.dom.Document; import org.xml.sax.InputSource; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.StringReader; import java.io.StringWriter; import java.io.StringWriter; public class XMLFormatter { private static Logger